Pulverizing apparatus.



E. G. THOMAS. PULVERIZING APPARATUS. APPLICATION FILED JAN. 24, 1908.

Patented Mar. 4, 1913.

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- Specification of Letters lPatent.

' Appnmmn'mea unitary 905. Serial No. 412,525.

To all whomt't ccacem Be a known that'I, EDWARD e. THOMAS,

of New York, county of New York, and

.pulverizing machinery, 1

State'ofNew York, have-invented and produced certain new and useful Im rovements in 'Pulveriz'ing Apparatus, of wh ch the following is a specification; My invention consists of improvements in hereby lfriable materials such as coal, cereals, -etc.,can be reduced to fine powders.

My apparatus consists in general of a ro- J tating wheel of an abrasive material such the revolving wheel, in combination with the fine material may be removed by.;.air separation, by screening or 'by\ any "other so as-emeryor carborundum, revolving about a horlzontal axis in a containing case,-wh1ch also contains mechamsmfor continually agi-y tatmg and forcing the. material to be pulverized against the periphery and sidesof means for feeding "untreated material and removing the material which has been ground to the desired fineness- The wheel performs two ofli'ces: first, that of tearing the material tozpieces and second, that of an elevating means for projecting the pow dered material into the air in'the space above the wheel, forming-a dust-cloud from which separating process.

The-advantages tobe'sec'ured by im- 'provements are,rapid pulverizingfor the amountof power used and sim lieity 'of mechanism. 'An, important application ofthe machine is the pulverizing of coal for use as fuel in the manufactured cement, in

reverberatory furnaces and in other .uses,

where averyhigh temperature is required and where it is desirable to economize through the morefperfect combustion attained when coal is'burned in a powdered form. This s ecification' is accompanied by drawings whichform apart hereof and upon cured to a shaft 2,

which reference numerals are used to desig v nate the parts referred to by these numerals.

in the text of the specification.

In the drawings Figure 1 is, a side eleva tion'and Fig. 2 a

front elevation of a preferred form of my apparatus. j p

In these figures, 1 is anabr'asive wheel sesupported in boxes 3 and driven by means ofpulley 4, The wheel s mounte'd'between flanges 5 and 6- Flange 5 is firmly secured to shaft 2 by akey and of the centrifugal cated in Figs. 1

. upper surf may be firmly pressed against wheel 1] bya' -1 t ean5a4,1e 3;

set-screwQ Flange 6slidesupon shaft-2 7 I I I nut.7, runmng'upo'na thread'8,cut upon,

shaft 2.

I Surroundingwheel 1 i'sa'case, 9,; comprislnga grinding fch'amber 32 at its lower end and a separating chamber 33' in its up shape r portion; Its inner surface. is

so" from a point 10" vbeneath the wheel to a point 11, approximately at'the height of shaft 2, that the space. included between the at V inner surface of the casing and thesurface Y Y of the wheel is of continually decreasiiig sec-1' 'tionin the direction of the rotation of the .wheel. A screw 12 on shaft 13 is journal'ed at the bottom of easing 9 and by'its rota-I ition serves to agitate and force the material;

to be pulverized into the space between the,

'surface of the wheel and the innerv surface .of chamber 9. Because the material isforced "continuously diminthe. space into which I a p p ishes in area, the material will be pushed" against the surface'of the wheel with a pressure suflicient for its 'rapid abrasion. The

wheel 1,'by.its rapid rotation will carry'the material. abraded'by it beyond -the point:

where the material in process is last in contact with it, and will then throw' the material in various upward rapid rotation, 'thus forming in the space within. the casing 9 and above the wheel 1;

directions by virtue force-imparted byjits a dust clou'd composed of particles of vary ing; sizes, from which elements of my inv'ention to extract the'particle's" of the desired fineness and deliver them from themachine.

it isthe duty-of other A feeding apparatus of any charactery which will give a uniform flow of raw nai i l {.(ythe machine can be used to keep-up.

the supply of material within the" casing {9, but If preferto use the construction, 1nd1 and 2; whichconsists ofa rotating table 17,'attached. to and driven by aivertica'lshaft 18,

through bevel gears from shaft 13. Qver 1 table 1'1 is" a vertically movable sleeve 19,

through which material isideliveredby a v I whichin'tu'rn is driv 10c tube 20, communicatingwith bins or hoppersin which the raw material is stored. A stationary scraper ace of 21, projecting over the the table continually removes the material brought to it by the ro- .tation of table 17- and causes it tofall. into casing 9 through openin 22 in the side of the casing to a point w ere it-can been- .thrown by the wheel to the wheel 1,

gaged by the screw 12 and fed into the work 1ng space beneath wheel 1. The sleeve 19 is supported by a yoke 23, which may be adjusted in position by nut 24 on a screwed rod 25. By motion of'nut 24, the yoke 23, and sleeve 19, may be raised or lowered, thus controlling the amount of material delivered through the lower end of sleeve 19 to table 17.

For the collection of the fine material from the dust-cloud at the upper part of the casing any separating device common to the art may be employed, but I prefer to use an air current, passing substantially vertically through the casing and ef carefully adjusted force, so that it will have strength to move upward only particles of the de-' sired size, permitting all others to fall downward into the lower part of chamber 9 for re-treatment. As illustrated in Figs. land 2 my separating device consists of an exhaust fan 26, of which the exhaust side is connected bysuitable piping 27, with the upper part of easing 9.

At the lower part of chamber 9 inlet openings 28, are provided, which may be adjusted in size by dampers 29 arranged to slide across said openings, their purpose being to regulate the quantity of air permitted to enter and pass through casing 9. As particles larger than the desired size may be a point where the alr current; in combination withtheir velocity will be suflicient to carry them out of chamber 9, I have arranged a series of baffles- 30, in the upper part of the chamber, so located that all the materialthrown up by must strike these bafllesandis thereby prevented from direct passage to the air outlet. The baflies 30, are preferably mounted in a frame 31, which-is adjustablv said case. A

rent through the machine is provided by an pipe 27 leading to which the fan may supply, thus varyopening inthe exhaust the atmosphere through draw a portion of its air ing the amount which through the casing 9.

The operation of the parts shown in the drawings is therefore as follows :The material to be pulverized is fed into the feed tube 20 and passes to the rotating table 17. Scraper 21 removes it from this table and delivers it into the interior of casing 9. A worm 12, forces it against the abrading wheel 1 which tears it to pieces and throws the particles into the air space above the wheel. The air current produced by the exhaust fan 26 removes the particles of the desired fineness and delivers them for their appropriate use elsewhere, while the coarser particles in the dust cloud, being too heavy to be carried away by the air current, fall again to the bottom of casing 9 and are again forced against the abrading wheel for further attrition. I

Having thus fully described my invention, I claim and'desire to secure by Letters Patent of the United States:

In a pulverizer, a closed casing having an inlet opening and an out-let opening, an abrasive 'wheel within said casing and mounted to rotate in a vertical plane, the inner surface of the casing adjacent to the wheel being so shaped from a point underneath the wheel to a point approximately the height of the shaft of the wheel that the space between that portion of the 02s ing-and the surface of the wheel continually decreases in the direction of the rotation of the wheel, means for forcibly supplying material to the-wheel, and means connected to the outlet opening for exhausting the finely divided material from'the casing. supported in'case 9 so thatthe baflies 30-. may be moved to various locations within. further control of the air cur EDWARD G. THOMAS. Witne'sses: V

WM. A. EVANS, ALLAN W. FoosE.

will be drawn 

